1812021354 has 128 divisors (see below), whose sum is σ = 4790741760. Its totient is φ = 506684160.

The previous prime is 1812021307. The next prime is 1812021359. The reversal of 1812021354 is 4531202181.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1812021359) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 624034 + ... + 626930.

It is an arithmetic number, because the mean of its divisors is an integer number (37427670).

Almost surely, 2^1812021354 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1812021354, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2395370880).

1812021354 is an abundant number, since it is smaller than the sum of its proper divisors (2978720406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1812021354 is a wasteful number, since it uses less digits than its factorization.

1812021354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2944 (or 2926 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1812021354 is about 42567.8441314568. The cubic root of 1812021354 is about 1219.1424041046.

The spelling of 1812021354 in words is "one billion, eight hundred twelve million, twenty-one thousand, three hundred fifty-four".